A triple bond is a type of covalent bond. It involves a sigma bond and two pi bonds (each bond involves 2 electrons). A carbon atom is capable of 4 bonds...a carbon-carbon triple bond is found in all alkynes.
A molecule is usually reserved to represent the smallest particle of a compound.
18 x 10^23. This is the answer because there are 6.022 x 10^23 atoms of carbon and 12.044 x 10^23 atoms of oxygen in one mole of CO2, if you combine them, you get 18 x 10^23